Technical information

18
For coaxial systems, the maximum
development value, mentioned in the
t
able above also takes into account
an elbow.
F
or twin flue systems the maximum
development value, mentioned in the
table includes the exhaust gas/air
intake terminal.
Type 5 outlets should respect the
following instructions:
1- Use the same ø 80 mm flue pipes
for the gas intakes and exhaust gas
ducts.
2- If you need to insert elbows in the
gas intake and exhaust gas ducts,
you should consider for each one the
equivalent length to be included in the
calculation of developed length.
3- The exhaust gas duct should jut
above the roof by at least 0.5 m.
4- The intake and exhaust gas ducts
in Type 5 must be installed on the
same wall, or where the exhaust is
vertical and the air intake horizontal,
the terminals must be on the same
side of the building.
There are some different types of flue
systems shown on Page 19.
For additional information regarding the
flue accessories, please consult the Flue
Pipe Accessories manual.
24 MFFI
E
xhaust Type
Use the
ø
40 mm
Restrictor(*)
Do not use
t
he
Restrictor
Maximum
Flue Length
Coaxial
Systems
ø 60/100
Type 1
Between
500 mm - 1 m
Between
1 m - 4 m
4 mType 2
Type 3
Coaxial
Systems
ø 80/125
Type 1
TBC TBC 10 mType 2
Type 3
Twin Pipe
Systems
ø 80/80
Type 4
Between
1m - 10 m
Between
10 m - 40 m
40 m
Type 5
Between
1m - 10 m
Between
10 m - 40 m
40 m
28 MFFI
Exhaust Type
Use the
ø 41 mm
Restrictor(*)
Do not use
the
Restrictor
Maximum
Flue Length
Coaxial
Systems
ø 60/100
Type 1
Between
500 mm - 1 m
Between
1 m - 4 m
4 mType 2
Type 3
Coaxial
Systems
ø 80/125
TBC TBC 10 m
Twin Pipe
Systems
ø 80/80
Type 4
Between
1m - 10 m
Between
10 m - 40 m
40 m
Type 5
Between
1m - 10 m
Between
10 m - 40 m
40 m
32 MFFI
Exhaust Type
Use the
ø 43 mm
Restrictor(*)
Do not use
the
Restrictor
Maximum
Flue Length
Coaxial
Systems
ø 60/100
T
ype 1
Between
500 mm - 1 m
Between
1 m - 4 m
4 mType 2
T
ype 3
Coaxial
Systems
ø 80/125
T
ype 1
TBC TBC 10 m Type 2
T
ype 3
Twin Pipe
Systems
ø 80/80
Type 4
Between
1m - 10 m
Betw
een
10 m - 40 m
40 m
Type 5
Betw
een
1m - 10 m
Betw
een
10 m - 40 m
40 m